JPS5884624A - Two-kind metal synthetic coin blank for coin medal or similar product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is formed from two metal parts, one inner part and the other inner part, both of which are integrated into one piece, and which can be used for coins, medals and the like. The present invention relates to a coin blank which is particularly comfortably suited for use in striking coins.

Metal coins, medals and similar items are displayed by stamping,
Obtained by stamping and printing signatures and predetermined symbols onto metal discs of various thicknesses and diameters, so-called coin blanks, the units represented on such coins may also be descriptors. In order to facilitate this, it should be noted that there is a dozu which means any piece of metal that should be considered money and has a shape different from a circle.

Taking metal coins as an example in particular, the initial coin blank is usually formed by a single alloy of two or more metals or even several layers of different metal alloys obtained by sheet processing.

Although such coin blanks are commonly used, this is particularly true as far as single metal coin blanks are concerned, as they are primarily linked to the weight and physical and mechanical properties of the materials used, resulting in great diversity of performance and functionality. This is not to say that there are no inconveniences that arise from restrictions.

By using the bimetallic coin blank according to the invention, the inconveniences of similar products according to the prior art are overcome or at least minimized, thus resulting in a combination of advantages, inter alia as follows.

the possibility of changing the weight of the final product without changing its dimensions; the possibility of changing the electrical and magnetic properties of the final product by the effect of changing the dimensions and properties of the materials forming the two components; The possibility of varying the cost in terms of the amount of material and the mold forming each of the coins; the production of dual metal coin blanks by using the improved equipment according to the invention is too expensive and generally results in counterfeiting of the coins. Greater security against counterfeiting as coin blanks absorb the profits that coins generally rely on; Vending machine greater security against fraud; possibility of making two-color coins.

It is therefore an object of the present invention to provide a bimetallic composite coin blank for coins, medals and the like, which has functionality and utility far greater than that of similar known products. .

BRIEF DESCRIPTION OF THE DRAWINGS The present invention relates to a metal hardening coin blank and will be explained in more detail by the description of preferred embodiments thereof, taken by way of example and without limitation, with reference to the accompanying drawings, in which: FIG.

Referring to FIG. 1, the outer periphery of a dual metal coin blank according to the present invention for use in the manufacture of coins is generally designated 1.

The outer periphery 1 is formed by a circular top 2 of a metal alloy or suitable metal and shows a slight bulge or rim 3 at the outer periphery, while the inner periphery is shown in detail in FIG. 1b. and best shown in FIG. 1c, it has the form of a taper 4 to obtain a considerably reduced peripheral edge, with several small teeth 5 extending inwardly from the peripheral surface along with the surface. and protrudes in the radial direction.

Figure 2 shows the inner center. Here the inner central part, generally designated 6, of the second class metal coin blank in question is shown, which is formed by a metal alloy or a disc T of a metal different from that of the outer periphery 1.

Said disk 7 also shows an edge portion 8 .

The diameter of the disc 7 is essentially the same as the diameter of the circumference passing at the free end of the small tooth 5 which projects from the reduced end of the inner periphery of the circular top 2.

To form a dual metal coin blank according to the invention, the above-described components are placed in a conventional mechanical press with the inner center 6 inserted into a circular opening in the outer periphery 1 (see FIG. 6). The two parts are placed in such a way that they are subjected to light compression to carry out an interferometric coupling of the parts, in order to prevent them from separating from each other during the following operations.

The two-metal hardening blank, which has been pre-compressed as described above, is placed in a conventional hardening press as shown in FIG. Both parts undergo a hardening stamping operation to determine the final bond. In fact, in said operation, said blank components are subjected to a crushing action due to the strong pressure applied to the conical numismatic stamping dies on the two faces of the double metal hardened blank, during which time the blank components are subjected to a crushing action as shown in FIG. As will be observed, the central disc 7 expands by a greater amount with respect to the outer circular crown 2 confined within the gold ring of the press, and by plastic sliding the inner circular crown 2 The free space of the taper 4 at the peripheral end is filled, while the small teeth 5 pass through the sides of the disc 7 and prevent any relative movement between the two components.

The forced bond that is torn as a result is therefore 2 according to the invention.
This does not leave any degree of freedom of relative movement between the parts forming the seed metal coin blank.

Although the embodiments according to the invention have referred to coin blanks for making metal coins which are circular in both the inner part and the outer part around them, as already mentioned, other coin blanks may be used at will. In applications, such as for example in the production of medals and similar articles, one or both components may be clearly considered as long as the contour of the inner part of the center corresponds to the inner contour of the inner part of the periphery. It is possible to change it as is.

The invention is therefore not limited to the embodiments described above, but includes any modifications of the implementation of the invention.

2A and 2B are a sectional view and a plan view, respectively, of the inner center portion of FIG. A sectional view and a plan view of the outer parts of FIGS. 1 and 2, respectively, of the second-class metal coin blank according to the present invention before forcibly joining the second-class metal coin according to the present invention; FIG. 4 is an assembled and preliminary 2 is a cross-sectional view of the outer portion of FIG. 1 and a front view of the inner portion of FIG. 2 of each of the two metal coin blanks according to the present invention in a compressed state, and these portions correspond to the coin shown in the conceptual diagram. Figure 5 shows the two-metal coin blank according to the invention after forced joining of the outer and inner parts of Figures 1 and 2, respectively; FIG.

In the diagram, 1...Outer part 2. Old...
Circular top 3.8... Edge part 4...
・・・・・・Tapered part of 2 5・・・・・・Small tooth 6・・・・・・Inner part molecule・・・・
... Disc agent Akira Asamura 4 people FIG, 1 1 FIG, 2 FIG, 3 FIG, 4

Claims (1)

[Claims] (1) In a class 2 metal coin blank for coins, medals, and similar items, an inner portion formed of a first metal or metal alloy; a second metal or metal alloy; an outer part having an opening in the center and suitable for seating said inner part, but whose outer shape corresponds to said inner part; for integrally joining said inner part with said outer part; and a fixing device for avoiding relative rotation between the inner part and the outer part. (2. The coin blank made of two metals according to claim 1, wherein the inner portion and the outer portion each have a lip at an outer circumferential end, Type 2 metal composite coin blank for medals and similar products. (3) In the type 2 metal coin blank according to claims 1 and 2, the outer part and the front nQ inner part are combined into one body. The device for coupling to the inner and outer parts produces plastic slippage in the metal or metal alloy of the inner part in the free space at the tapered ends of the outer part by crushing the inner and outer parts. A composite coin blank for coins, medals, and similar items, characterized in that it is formed by the inner ends of the inner ends of the outer portion so as to allow the blank. (4) Claim 6 In the second class metal coin blank according to paragraph 1, wherein said device for avoiding relative rotation between said inner part and said outer part is reduced in size resulting from said taper of said inner end of said outer part. A two-metal composite coin blank for coins, medals, and similar products, characterized in that it is formed by a plurality of protrusions integral with a surface facing inside the edge of a thick portion. (5) Claim No. In the class 2 metal coin blank according to item 3, the crushing operation for achieving an integral connection of the inner part and the outer part is performed by forming the class 2 metal coin blank into a coin in a coin press. A two-metal composite coin blank for coins, medals, and similar products, which is used during the pressing operation. (6) Coins, medals, etc., using the two-metal coin blank according to claim 1. and similar products, the coin blank is placed in a mechanical press and the following steps are carried out therein, while the inner part of the coin blank is lightly injected to prevent it from separating from its outer part. subjecting it to compression; and placing the pre-compressed coin blank in a coin press and carrying out a coin pressing operation therein, whereby said integral coupling device and said securing device are brought into contact with each other by crushing. A method for manufacturing coins, medals, and similar products, characterized in that the inner part and the outer part are forcibly connected in an inseparable manner to the extent that no freedom of movement is left.